Graham cursed at acting DOD chief, declaring himself his 'adversary'

Sen. Lindsey GrahamLindsey Olin GrahamGraham throws support behind Trump's Turkey sanctions Hillicon Valley: Warren takes on Facebook over political ads | Zuckerberg defends meetings with conservatives | Civil liberties groups sound alarm over online extremism bill Fury over Trump Syria decision grows MORE (R-S.C.) says he confronted President TrumpDonald John TrumpBusiness school deans call for lifting country-specific visa caps Bolton told ex-Trump aide to call White House lawyers about Ukraine pressure campaign: report Federal prosecutors in New York examining Giuliani business dealings with Ukraine: report MORE’s acting Pentagon chief in a heated exchange over the administration’s Syria strategy.

Speaking to acting Defense Secretary Patrick ShanahanPatrick Michael ShanahanDefense chief calls on European allies to be wary of China's investments, blasts Russia Pentagon chief approves 20 more miles of border wall Why Dave Norquist is the perfect choice for DOD's deputy secretary MORE at a briefing at the Munich Security Conference last weekend, the senator said he cursed at Shanahan and declared him an adversary.

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Graham described his remarks to Washington Post columnist Josh Rogin, saying he told Shanahan that the Trump administration's plan to withdraw all U.S. troops from Syria by the end of April was “the dumbest f---ing idea I’ve ever heard.”

“Well, if the policy is going to be that we are leaving by April 30, I am now your adversary, not your friend,” Graham said he told Shanahan.

Officials told NBC News about the exchange, with some lawmakers saying the briefing left them with less confidence in Shanahan, and one describing the episode with Graham as “pretty tense.”

Shanahan reportedly further frustrated lawmakers by refusing to state his opinion on President Trump’s Syria decision.

A Defense Department official told NBC News that the meeting “ended on a positive note” despite the tense exchange.

Shanahan stepped into the role of Defense chief after James MattisJames Norman MattisUS leaves dozens of 'high value' ISIS detainees behind amid Syria retreat: report White House officials stand by Syria withdrawal, sanctions delay amid bipartisan pushback Sunday shows — Officials rush to Trump's defense on Syria, sanctions MORE abruptly left the administration in what was seen as a rebuke of Trump’s Syria strategy.

Graham has been one of the harshest Capitol Hill critics of Trump’s Syria withdrawal plan. He continued that criticism after the exchange with Shanahan, telling the Post’s Rogin: “After Iraq, not only would this be a mistake, this would be almost an unpardonable sin, in the sense that you know what can happen. This can risk his whole presidency.”